package com.hage.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hage.reggie.common.CustomException;
import com.hage.reggie.dto.DishDto;
import com.hage.reggie.entity.Dish;
import com.hage.reggie.entity.DishFlavor;
import com.hage.reggie.entity.SetmealDish;
import com.hage.reggie.mapper.DishMapper;
import com.hage.reggie.service.DishFlavorService;
import com.hage.reggie.service.DishService;
import com.hage.reggie.service.SetmealDishService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private SetmealDishService setmealDishService;


    /**
     * 新增菜品，同时保存对应的口味数据
     * @param dishDto
     */
    @Transactional
    public void saveWithFlavor(DishDto dishDto) {
        //保存菜品的基本信息到菜品表dish
        this.save(dishDto);

        Long dishId = dishDto.getId();

        //菜品口味
        List<DishFlavor> flavors=dishDto.getFlavors();
        flavors = flavors.stream().map((item)->{
           item.setDishId(dishId);
           return item;
        }).collect(Collectors.toList());


        //保存菜品口味数据到菜品口味表dish_flavor
        dishFlavorService.saveBatch(flavors);

    }


    /**
     * 根据id查询菜品信息 和 对应的口味信息
     * @param id
     * @return
     */
    @Transactional
    public DishDto getByIdWithFlavor(Long id) {
        //查询菜品基本信息，从dish表查询
        Dish dish = this.getById(id);

        DishDto dishDto=new DishDto();
        BeanUtils.copyProperties(dish,dishDto);

        //查询当前菜品对应的口味信息，从dish_flavor表查询
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,id);
        List<DishFlavor> flavors = dishFlavorService.list(queryWrapper);

        dishDto.setFlavors(flavors);

        return dishDto;
    }


    /**
     * 修改菜品
     * @param dishDto
     */
    @Transactional
    public void updateWithFlavor(DishDto dishDto) {
        //更新dish表基本信息
        this.updateById(dishDto);

        //清理当前菜品对应口味数据---dish_flavor表的delete操作
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,dishDto.getId());
        dishFlavorService.remove(queryWrapper);

        //添加当前提交过来的口味数据---dish
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors = flavors.stream().map((item)->{
            item.setDishId(dishDto.getId());
           return item;
        }).collect(Collectors.toList());

        dishFlavorService.saveBatch(flavors);

    }

    /**
     * 删除菜品 和 菜品关联的口味数据
     * @param ids
     */
    @Transactional
    public void removeWithFlavor(List<Long> ids) {
        //菜品的状态确定是否可以删除
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.in(Dish::getId,ids);
        dishLambdaQueryWrapper.eq(Dish::getStatus,1);

        int count1 = this.count(dishLambdaQueryWrapper);
        if(count1>0){
            //如果不可以删除，抛出一个业务异常
            throw new CustomException("菜品正在售卖中，不能删除");
        }

        //套餐是否关联了菜品
        LambdaQueryWrapper<SetmealDish> setmealDishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealDishLambdaQueryWrapper.in(SetmealDish::getDishId,ids);
        int count2 = setmealDishService.count(setmealDishLambdaQueryWrapper);
        if(count2>0){
            throw new CustomException("菜品已关联套餐，不能删除");
        }


        //如果可以删除，先删除菜品表里的数据---dish
        this.removeByIds(ids);

        //删除关系表里的数据---dish_flavor
        LambdaQueryWrapper<DishFlavor> dishFlavorLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishFlavorLambdaQueryWrapper.in(DishFlavor::getDishId,ids);
        dishFlavorService.remove(dishFlavorLambdaQueryWrapper);


    }


}
